WAEC Further Mathematics 2022 Objective — Question 21
Question 21 of 40 from the West African Examinations Council (WAEC) Further Mathematics 2022 Objective paper, with the correct answer and a full explanation.
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If PQ=−2i+5j and RQ=−i−7j, find PR.
- A. −3i+12j
- B. −3i−12j
- C. −i+12jCorrect
- D. i−12j
Explanation
QR=−RQ=i+7j. PR=PQ+QR=(−2i+5j)+(i+7j) = −i+12j.
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